burn ccbec ?
 

last night I was tempted to use my airtronics 2.4ghz radio on my truggy and all is looked fine the mamba max red wire are disconnected.. I connected the mamba esc on throttle slot and the servo into the steering slot .. now the bec I was connected it to the battery slot on the receiver... all worked good for around 20sec then the bec have stopped working I touch it and it was HOT now the I think the bec was burn ... I used 12 cells in series to startup up the receiver and bec...

there is the the manual of my radio ...

www.airtronics.net/manual/MX-3FHSS.pdf

I have see the receiver a NONE BEC integrated maybe why the problem ?

I'm not sure, but I think "none BEC" just means there is no BEC in the receiver itself. Even if it meant the receiver is not BEC-compatible, the way you had it hooked up is fine (BEC in battery slot).

I can think of several reasons why the BEC got hot, in order of probability.:

- Servo overload. If a servo was stalled (like steering trying to move beyond the mechanical limits), it can pull quite a bit of current.

- You hooked the BEC input to only one of the battery packs and used the wrong one. Most ESCs (if not all) have a common ground connection between the negative battery pack connection and the throttle ground connection. If the BEC input was hooked to the wrong single pack, the ground was actually at 1/2 the battery voltage.

- Defect in the BEC itself.

- Reverse polarity on the BEC input. I don't believe this is the case as it wouldn't work at all if this happened.

hmm when I plug it again the green led dont going ON and the BEC get HOT

I tried to plug it into my computer via castle link usb and my sofware dont detect it...

Well, it is obviously permanently damaged so you'll need to contact Castle. Before you get a new one, I would go over the wiring and check your servos so that the next BEC won't fry as well.

just send it in, they will send you another one out. no need to call

ok I will sent it out to castle :smile:

I use that radio system and have used it with a MM/ CC bec/4s lipo/1515 1y for months. The receiver just has no bec and you must be sure not to set your bec for over 6v as anymore and the receiver frys (dunno why, probably why they quit making them lol) Just thought id share, Brian has it covered as usual. :yipi:

jayjay ok so I put 6v setting for the bec via castle link usb computer software and does the bec connect to the battery slot or aux on this receiver ?

yeah I just set it at 6v, plugged the bec into the receiver (batt slot) make sure of + & - and good to go. If no lights its fried... You don't NEED a bec to run 12 cells on the MM, sure it would run cooler but try it without it ?

I hate to disagree, but I will. :smile: 12 cells with a very conservative 0.5A load will force the MM's linear BEC to dissipate 4.2w of power. Let's not forget the MM's BEC is enclosed with no heatsinking. It'll work for a while, but why risk it? I would use a receiver pack instead if I had to.

wow, that would get hot. Just buy a MMM !

I use a four AA battery holder for now I have just connected it into the battery slot on the receiver work fine... not sure if this can last for some pack without the need of recharging.. and if the battery ( AA ) get very low do I can lost control of my rc since it power the receiver & servo?

Most ESCs are set up to not do anything if it doesn't receive a signal from the receiver. So, if your Rx battery pack gets too low, you might get some erratic behavior (especially when turning which causes the voltage to dip lower momentarily) before the system just stops. It should not turn into a runaway like a nitro though.

ok cool I use the mamba max 1/10 esc I think it have a protection for this...

how much time you think 2000+ mah four AA will last as receiver pack ?

Depends on the servo torque/speed, weight of vehicle, and tire specs. I would estimate an average servo draw on a truggy with truggy tires to be around 1A-1.5A. At 1A, 2Ah batteries, would last ~120 minutes. At 1.5A, 2Ah batteries would last ~80 minutes.

ok thanks.

do I can use 4 AA rechargeable batteries without any problem for my rx pack ?

I see some threads who peoples said I must use a regulator ...

Depends on torque/speed/number of servos. If using one pretty decent speed/torque digital steering servo, the average load with be around 1A. That will net around 2 hours of "runtime", give or take.

I only run one servo this one :

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXUZ80

and for the receiver is this one :

http://www3.towerhobbies.com/cgi-bin...?&I=LXPNT0&P=7

4 AA rechargeable batteries are only 1.2V each for a total of 4.8V. I don't think taht is enough to power your xervos. I'm using 5 2500mah AA rechargeables for my 5955TG servo on my gmaxx.

... I dont want to playing with a 5 cell pack and other addons why dont can keep thing simple ? :grrrrrr:

You asked if you're going to run with problems using 4 rechargeable batteries and I answered your question. If you don't want to hear any inputs, then don't ask any questions.

Just go ahead and use 4 rechargeables but make sure you post your experience so others will know that 4.8V is not enough. 4 AA disposables work as stock since they are 1.5V each for a total of 6V but loses voltage faster compared to rechargeables.

which damage I can get ?

I don't think you'll "damage" anything, but the receiver may "reboot" when/if the voltage drops much below 4.8v when under heavy servo load.

Like George said If using alkaline cells, 4 is good because they are at 1.5v each (6v). If using NiMHs, 5 rechargeable cells would be better because you'll get around the same 6v.

George16 : sorry bro I just hate find a quick fix on a failure and need to undo this quick fix for something I have to wait for get it.. nothing about you :mdr:

how about this :

http://www3.towerhobbies.com/cgi-bin...?&I=LXVTG0&P=7

?

sure this will get me good runtime ;)

that Rx pack will be pretty big, about the same size as a MMM ESC, you might want to go with a pack in the 1400-1600 mah range

this small capacity pack would give me very low runtime...

all the pack is doing is power your Rx, it will give you plenty of run time

I have 1100, 1400, and 1600 mAH Rx packs for my Nitro Rustler and even the 1100 will run for several hours before needing charged. The longest I've EVER run it for was 6 hours. When I started the 1100 was partly used (probably had about 800 mAH left) and I ran it for 2 hours or so before changing out to my 1400 which lasted until I packed it up because it was getting too late to run (darned nitros).

sorry for hijacking the thread , but r these ccbec`s reliable? i heard some horror stories, did anybody have more experience with them ?
thanks